Bolt for piston follower-plates.



H. W. DAVIS. BOLT FOR PISTON FOLLOWER PLATES.

APPLICATION FILED MAY 16, 1911 1,018,741. Patented Feb.27, 1912.

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HENRY W. DAVIS, 01? MARTIN'S FERRY, OHIO.

BOLT FOR PISTON FOLLOWER-PLATES.

Specification of Letters Patent.

Patented Feb. 27, 1912.

Application filed May 16, 1911. Serial No. 627,619.

To all whom it may concern:

Be it known that I, HENRY W. DAVIS, a citizen of the United States ofAmerica, and resident of Martins Ferry, county of Belmont, and State ofOhio, have invented cert ain new and useful Improvements in Bolts forPiston Follower-Plates, of which the following is a specification.

This invention relates broadly to improvements in bolts, andspecifically to a bolt for attaching piston follower-plates, and thelike.

The primary object of the invent-ion is to provide a bolt for attachingor securing follower-plates upon the faces of pistons, which is providedwith means whereby, when broken, the broken outer end will be supportedand prevented from dropping out into the interior of the cylinderbetween the piston and the cylinder-head.

As is well known, the ordinary bolts, by means of which pistonfollower-plates are secured in place, frequently break in two while theengine is in operation, and the outer ends, being thus freed, work outand drop down between the moving piston and the cylidner head. Theresult of this is oftentimes disastrous, not only to the engine itself,but also to life and adjacent property, since the connections betweenthe cylinder and its head are disrupted by the bolt end being forciblythrust by the piston against said head, allowing the latter to blow off.

The purpose of the present invention is to obviate the objection to theuse of the ordinary types of bolts above noted.

A further object Within the contemplation of this invention is toprovide a bolt having means whereby, when the cylinder head is removedfor piston inspection, the presence of broken bolts may be readilydetected.

The invention accordinglyconsists in the features of construction,combinations of elements and arrangement of parts which will hereinafterbe exemplified, reference being had to the accompanying drawing, forminga part of this specification, in which Figure 1 is a front end elevationof a portion of a piston, a portion of the followerplate being brokenaway, showing a cross section of the bolt; Fig. 2 is an enlargedlongitudinal sectional view of a fragmentary portion of a piston towhich the invention is applied, said section being taken on the line2-2, Fig. 1; Fig. 3 is a similar view,

showing the bolt broken in two; and Fig. 4 is a side elevation of thet-ie-pin, detached. Referring to said drawing, in which like designatingcharacters distinguish like parts throughout the several viewslindicates the body, 2 one of the radial arms or spokes extending outwardfrom the nave 3, 4 the junk-ring, 5 the packing rings, and 6 thefollower-plate of an ordinary type of piston.

For attaching or securing the followerplate 6 to the arms or spokes 2,which arms or spokes may be integral with the body 1, as shown,'Iprovide a plurality of bolts 7 of stud-bolt type. The inner threaded endof each bolt is seated in the arm or spoke 2, while a nut 8 is drawn upon the outer threaded end thereof, said nut being received in a socket 9provided therefor in the outer face of the follower-plate. Theunt-hreaded intermediate portion of the bolt is received in the hole 10in the follower-plate, as shown.

The bolt 7 has a central longitudinal bore 11 extending therethrough,which, at its inner end, is outwardly flared to form a seat for thereception of the spread or upset inner end 12 of a tie-pin 13 which liesin said bore. The opposite, or outer, end of said pin has a head 14formed thereon, which head lies within a socket 15 provided in the outerend of the bolt, said socket being of larger diameter than the bore 11with which it registers, and an annular shoulder 16 being formed at thejunction of said socket and said bore. Said head 14 normallyoccupies anunseated positionthat is to say, the head lies within and at the outerextremity of the socket.

Should the bolt be broken in two, the freed outer end thereof will moveoutward until the shoulder 16 engages the head 14, as shown in Fig. 3.Said end will there be supported by the rigidly held tie-pin and thusprevented from falling out of the piston. In this position the knockingof the freed end against the cylinder-head with each outward stroke ofthe piston should ordinarily serve to apprise an attendant of the brokenbolt. Should this warning be unnoticed or unheeded, no injury or damagewould ordinarily be occasioned, since the remaining bolts would, underordinary circumstances, serve to retain the followerplate in place. Whenthe cylinder head has been removed for piston inspection, any

broken bolts may readily be detected by simple observation of therelative positions of the outer ends of the bolt and the heads 14 of thepins, since, as hereinbefore indicated,

5 the said heads normally occupy positions in the outer ends of thesockets 15.

From the foregoing it will be seen that I provide an extremely simpleand efficient device for preventing damage incident to the breaking offollower-plate securing-bolts. It will further be seen that variousslight changes or alterations, within the scope of the appended claims,may be resorted to without departing from the general spirit l or scopeof the invention.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is-

1. A bolt for follower-plates, comprising *:a one-piece bolt-body havinga longitudinal smooth bore therethrough, and a pin mounted in said borefor preventing dissociation of the opposite ends of said body when thelatter is broken.

2. A bolt for follower-plates, comprising a one-piece bolt-body having alongitudinal unthreaded bore therethrough, and a tie-pin mounted in saidbore and having connection with the opposite ends of the body whereby,

*when the latter is broken, the parts are held in substantially fixedrelation.

8. A bolt for follower-plates, comprising a one-piece bolt-body having alongitudinal unthreaded-bore therethrough, and a tie-pin 353mounted insaid bore in fixed relation to one end of the body, said pin having ahead on its opposite end for preventing dissociation of the freed end ofthe body when the latter is broken.

40: 4. A bolt for follower-plates, comprising a bolt-body of stud-bolttype composed of a single piece having a longitudinal bore therethrough,and a tie-pin of greater length than said bore mounted in the latter and451having heads on its opposite ends in interlocking relation to theopposite ends of the body, whereby, when said body is broken in two, thedissociation of the parts is prevented, one of such brokenparts beingpermitted to freely move outward against one of said heads.

5. A bolt for follower-plates, comprising a one-piece bolt-body having alongitudinal unthreaded bore therethrough, a tiepin mounted in said boreand having heads on its opposite ends in interlocking relation to theopposite ends of the body, whereby, when said body is broken in two, thedissociation of the parts is prevented, and visible means for indicatingthe condition of said body.

6. A bolt comprising a one-piece bolt-body having a socket in its outerend and a central unthreaded bore extending therethrough, a pin mountedin said bore with its inner end in fixed relation to the inner end ofsaid body, and a head formed on the outer end of said pin and occupyinga position in said socket.

7. A bolt comprising a one-piece boltbody having a socket in its outerend and a central bore extending therethrough, a pin I mounted in saidbore with its inner end in fixed relation to the inner end of said body,and a head formed on the outer end of said pin, said head normallyoccupying a position in the outer end of said socket.

8. A bolt comprising a onepiece boltbody having a socket in its outerend and a central bore extending therethrough, an annular shoulder beingformed at the junction of said socket and said bore, a pin mounted insaid bore with its inner end in fixed rela tion to the inner end of saidbody, and a head formed on the outer end of said pin, said head normallyoccupying an unseated position in said socket and being adapted to seaton said shoulder when the outer end of said body moves outward, as whenthe latter is broken in two.

In testimony whereof I afiix my signature in presence of two subscribingwitnesses.

HENRY W. DAVIS.

Witnesses:

H. E. DUNLAP, BRUCE MORRIS.

I Copies of this patent may be obtained for five cents each, byaddressing the Commissioner of Patents,

Washington, D. G.

